In the figure below, ABCD is a parallelogram, AD = 18 and DC = 27. Segments EG and FH are perpendicular to sides of the parallelogram as shown, and EG = 16. Determine FH.
The area of a parallelogram can be found by multiplying a side times the height to that side.
Since you will get the same answer using whatever side you want to use:
Area = FH x AD = EG x DC
---> FH x 18 = 16 x 27
---> FH = 24